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I am trying to mount a hard drive with an XFS filesystem on it in Ubuntu. It was originally formatted in a netgear stora NAS device.

I am using a command in ubuntu like this,

sudo mount -t xfs /dev/sdc1 /mnt/stora

The command craps out the whole operating system. The GUI closes, a command prompt comes up and the machine is useless from that point, I have to reset. The error is this,

BUG: Unable to handle kernell NULL pointer derefence at 0000000c
xfs_alloc_fix_freelist

So I take it there is an XFS module and there is a bug. I have installed a clean 11.04 Ubuntu, so is there perhaps some bug fixes for the XFS module?

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Could you please post the output of fdisk -l /dev/sdb? I suppose the device for your partition may be /dev/sdb1 and not /dev/sdb. – uloBasEI Jul 30 '11 at 8:10

Regarding the output of the fdisk command, I would mount your partition using the following command:

sudo mount -t xfs /dev/sdb1 /mnt/stora

The error message you get comes from a typo: the device to your partition is /dev/sdb1 and not /dev/sdb.

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Right, that is not working. Should I expect some output from the command disk -l /dev/sdb1. Having said that I used that command after I had done the mounting. So after the mounting the folder mnt/stora is an empty folder, and the free space says '4.4GB' which is the same as the mnt folder, so the mount didn't do anything. – peter Jul 30 '11 at 9:04
    
Also if I try umount /mnt/stora, umount /dev/sdb1, umount /dev/sdb they all say that is is not mounted. Which one is correct out of interest? – peter Jul 30 '11 at 9:06
    
The command fdisk -l from my last comment was just to know the partition layout of your hard drive and to be sure that your xfs partition was located on /dev/sdb1. Using it after sudo mount -t xfs /dev/sdb1 /mnt/stora should not change anything to its output. Is the command mount | grep /dev/sdb1 returning anything after you have mounted your partition with sudo mount -t xfs /dev/sdb1 /mnt/stora? If not, did you get any other error message when mounting the partition? – uloBasEI Jul 30 '11 at 12:43
    
No error messages or anything. I was running ubuntu inside a VM, but now I decided to install it with WUBI. The result is that the mounting operation craps out in a completely different way. The GUI closes, and a command prompt comes up. Take a look at the question, I will update it. – peter Jul 31 '11 at 2:59

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